Visible crew/equipment: As Mrs. Deagle is walking along the street, carrying the broken snowman head, as she passes one store, clearly reflected, a little ahead of her, is a man carrying the boom mike. (00:10:00)
Visible crew/equipment: In the classroom a Gremlin takes an apple, then eats it behind a desk. The Gremlin then throws it from behind the desk. Look closely and you will see the apple is actually thrown by a human hand, not a Gremlin hand. (00:48:00)
Visible crew/equipment: When a gremlin attacks the Mum from a Christmas tree, and the tree falls on top of her, you can clearly see a member of the crew with eyeglasses, wearing a red shirt, standing behind the tree pushing it forward on top of her. (00:54:30)
Visible crew/equipment: In the scene where the cop car flips over, if you pay attention, you can see the metal plate that's welded under the car that helps it flip over. (01:08:25)
Visible crew/equipment: In the bar, as one Gremlin bangs his beer glass on the table, you can see a wire attached to his arm, leading under the bar. (01:10:40)
Visible crew/equipment: When Stripe is attacking Billy with the chainsaw, when the camera pans to the side right before Stripe attacks you can see a crew member's hand place Stripe over Billy. Also you will notice that there is a piece of plywood attached to Stripe's feet. (01:29:10 - 01:32:55)
Visible crew/equipment: Before Billy's mum pushes the gremlin into the microwave, you can see the top of a crew member's head, on the left of the gremlin, next to the microwave.
Chosen answer: The precise cut-off point is never stated - I've generally assumed that the embargo on feeding finishes once the sun comes up.
Tailkinker ★